Thick Pad——Seating diameter:15.75 inches,Thickness:4.7 inches;Thicker than ordinary.It help you sitting comfortable even after many hours. Rolling Smoothly——360° Swivel caster and ultra-quiet wheels allow for easy movement.Soft polyurethane wheels can prevent scratches on your floor.Easy to assemble/disassemble. Height Adjustable——Adjusting the height(from 20.67'' to 26.97'')with the Adjustable hydraulic gas lift.The chair’s cylinder has a short lift height.Please refer to the picture for the specific sizes before purchase,but Standard air gas lift can be replaced. Sturdy Durable——Weight Capacity is 400 lb.The base(20.47'')is thick and strong, the casters are high quality and durable. Wide application——It is a necessary tool for beauty hair salon,tattoo studio,shop,clinic,lab,home and office. Rolling Chair Color:Gray Material:Aluminum,iron,sponge,PVC Adjustable Height:20.67-26.97 inches Seating Diameter: 15.75inches Seating Thickness: 4.7inches Base diameter:20.47 inches Weight capacity:400 lbs *Customer service:Please contact us for any issue.We are always willing to provide technology support and customer service.Our goal of after-sales service is to give our customers satisfied products and shopping experience.If you have any quality problem in one year,you will get 100% satisfied solution.